Finding the Fourth Proportional to 2,112.14, 3,167.38 and 878.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.14 : 3,167.38 = 878.72 : x
2. Step 2: Convert to fraction form
   2,112.14/3,167.38 = 878.72/x
3. Step 3: Cross multiply
   2,112.14x = 3,167.38 × 878.72
4. Step 4: Simplify right side
   2,112.14x = 2,783,240.15
5. Step 5: Solve for x
   x = 2,783,240.15/2,112.14
6. Step 6: Final answer
   x = 1,317.73